I've never really understood the existing 'piste' map at Aonach Mor that applies to over the backs. If they were pisted entry points into the Coire Dubh, then fine, you could say some were easier than others (ie red/black or whatever) but they're not.
They're all dependent on that day's conditions, even the time of day.
What might have been an easy and popular entry one day could easily be the hardest the next with an overnight freeze railroad entry.
On the existing map, Spikes and Summit are marked as 'yellow' routes, which indicates to me that a far higher degree of awareness should be required than any of the 'marked' red/black entries in Coire Dubh, yet despite that, I've more often found the marked entries into Coire Dubh way more intimidating, simply due to freeze/thaw effects on the entry points which are much more prevalent there than say in Summit Gully (due mainly to cornice).
Seems sensible to me to mark them all as 'itineraries', but then again, does it really make that much difference?
Most folk when skiing there first time will have a look and shy away from the backs, unless they're with folk that have experience of it or they have the ability that they'll know they're capable of managing it. And full map/compass use and snow awareness should be the minimum for all but the superheroes

going in there.